Preparation and characterization of bio-based polyamide 510 elastomer
Biobased polyamide 510 was prepared by melt polycondensation using biobased pentamethylenediamine and sebacic acid as monomer.Bio-based polyamide 510 elastomers was prepared by a two-step melt polycondensation method using polyamide 510 with double-terminal carboxyl groups as the hard segment and polyethylene glycol as the soft segment.Nuclear magnetic resoce hydrogen spectrum and Fourier transform infrared were used to characterize the chemical structure of polyamide 510 elastomer.Thermal properties of polyamide 510 elastomer were tested by differential scanning calorimetry and thermogravimet-ric analysis,and the mechanical properties were tested by universal testing machine.The results show that the melting point,crystal-lization point,initial thermal decomposition temperature and maximum decomposition rate temperature of polyamide 510 elastomer are 210,163,395℃and 452℃,respectively,which are lower than those of polyamide 510,217,177,410℃and 456℃.In the thermal properties the polyamide 510 elastomer has a wide processing window compared to polyamide 510.In terms of mechanical properties,the tensile strength of polyamide 510 elastomer is 42.7 MPa,which is lower than the tensile strength of polyamide 510,60.3 MPa.Nevertheless,the elongation at break of polyamide 510 elastomer is 224%,which is higher than that of polyamide 510,172%,polyamide 510 elastomers are more flexible than polyamide 510.In the rheological analysis,the energy storage modulus,loss modulus and complex viscosity of polyamide 510 elastomer are lower than those of polyamide 510.This is because polyethylene glycol affects the crystalline structure of polyamide 510 and the integrity of the crystalline form.
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